A researcher adds a "tag" of several histidine residues to an engineered protein in order to purify the protein using

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The addition of a "tag" of several histidine residues to an engineered protein is a common technique used for purification through Metal Affinity Chromatography (MAC). In MAC, the histidine tag binds to metal ions (such as Ni2+ or Co2+) that are immobilized on a column, allowing for specific binding and purification of the tagged protein.

A Researcher Adds a "Tag" of Several Histidine Residues to an Engineered